Pulverizing-machine



(No Model.)

R. D. GATES.

PULVERIZING MACHINE. No. 287,658. Patented 001;. so, 188s.

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` UNITED i STATES PATENT OEEICE.

Brunson D. GATES, or oHIoAGo, ILLINOIS.

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SPECIFICATION forming'part of Letters Patent No. 287,658, dated October30, 1883.

Application inea April 11, Issa. (No model.)

` To all whom it may concern:

Be it known that I, RYERsoN D. GATES, a citizen of the United States,residing at Chicago,in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Pulverizing-lvlachines, ofwhich the following is a specification.

My invention relates to an improved construction and arrangement of thepulverizer for which Letters Patent No. 260,092, dated June 27, 1882,were granted to me, and the inature of the same will be fully understoodfrom the following description, claims, and accompanying drawings,in-which' latter- Figure lois a Vertical longitudinal section of myimproved machine, and Fig, 2 is a verti- I cal section and broken viewof the samerl The section is taken in the lineg/ I/ of Fig. 1, aportionof the end of the screen-case being broken outand a portion of Atheelevator shown in cross-section. j c i' Ain the accompanying drawingsrepresents a frame for supporting a central revolving shaft, B; a case,C, in which a pair of pulver-` iZing-rollers, D D, are placed;a case, E,in which a tapering circularscreen, F, with elevator F attached, isplaced; a return feed screw, G areturn conducting-spout, H, and gearingfor operating the rollers, return feed screw, screen, and elevator. 1

The roller-case C may be properly fastened to the yframe by means ofsuitable anges provided on its stand or base c, and in like manner thescreen and elevator-case E may be fastened in position upon the frame.

In the pulverizer-case C the pair of pulverizing-rollers D D are hung bymeans of shaftsA b, which are supported in ordinary bearings, c c, ofyokes c c', which are supported in the ordinary manner by side brackets,d d, of thev yoke, and one of each pair stationary with the case C, sothat the distance at which the rollwith it.

ers stand apart may be regulated as occasion i' er length on one side ofthe case C than the shaft which is fitted to the adjustable journal-`bearings, in order that it may be passed through a spider, W, saidspider being suspended upon the revolving central shaft BY in such amanner that the said shaft can revolve within the vopening in thespider, through which it loosely passes, without carrying the spiderrlhe shorter shaft b is so terminated on the same side of the case C asto not reach the spider, and it can thus move with its journal-bearingwhenever Jthe bearing is adjusted with the roller. These rollers aregeared together by toothed wheels-such as eon shafts b, and are revolvedtogether by gearwheels f f', wheel f being on shaft B and wheel f on oneof the roller-shafts. Motion is imparted-to the said central'shaft B bygearwheels g g and a ,pulley, g2, wheel g` and pulley g2 being on ashaft, I, and wheel g on shaft B; or motion may be imparted directly tothe Vshaft B bya pulley, which may be applied di- :discharge-chute, h',the latter passing through the head of screen-chamber E and extendinginto the revolving screen F, as shown.

0n the central shaft Bthe return feed screw G is constructed, and thisscrew occupies a place in the case C between inclined guiding andguarding plates z' t, constituting a threesided secondary feed-hopper,extends through the screen F, and terminates .at the end of the elevatorF', as shown.

The conducting-spout H is angular or L- shaped, and its receiving end jstands vertical with respect to its horizontal portion and being thusshaped, arranged, and permanently fixed upon the stationary screencase,it serves for receiving and conducting'back to the rollers. D D theimperfectly-pulverized substances which pass from the inside of thescreen into the elevator F. The said elevator F', with the screen Funited to it, is keyed fast upon one end of the shaft B, and said shaftis supported in bearings of the frame IOO A and case E, as shown, andthe elevator F is provided with V-shaped buckets m on its innerperiphery, and these buckets take and carry up the substances to aposition directly over the portion j of the return conductingspout H.The screen is made flaring in a rearward direction, and the finelypulverized substances pass over the wire-gauze of the screen and aredischarged through its meshes into the sercen-case, to be removedthrough the funneldike passage oz, while the partially-pulverizedsubstances move backward on the inclined surface of the said wiregauzeand pass into the elevator, to be carried up and dropped into thevertical portion j of the conductor-spout H.

It will be seen that the screw, by revolving with the shaft B andscreen, causes the imperfectly -pulverized substances which descend uponit through portion 7' of conductor H to pass back into the case C, thenbetween the rollers and into the screen F, through the meshes of whichit passes into the screen-case as finely-pulverized product to bedischarged through passage n.

If desired, the case C maybe provided with more than one pair of rollersD D, as illustrated in my application for a patent filed in the UnitedStates Patent Office on the 4th day of April, 1883, in whichconstruction the return feed screw would occupy a place in case C eitherbetween two pairs of pulverizing-rollers, or above two, three, or morepairs, just as found most convenient.

Vhat I claim as my invention, and desire to .secure by Let-ters Patent,is-

l. The co1nbination,with the central revolving shaft and its gearing, ofthe flared revolving screen F, having an elevator, F', on its flaredend, the stationary conductingspout H j, return feed screw G,pulverizingrollers, and

ing mechanism,pulverizing-rollers, their case, and the gearing of therollers, substantially as and for the purpose described.

3. rI he combination of the case C, pulverizing rollers D D, the case E,combined screen and elevator F F', means for forming communicationbetween the screen F and the case C, shaft B return screw feeder G,conductorspout H j, and suitable gearing for operating thepulverizing-rollers, screw feeder, and combined screen and elevator,substantially as and for the purpose described.

4. The combination, with the screw feeder G H, ease C, and rollers D D,of the hopper 7L and secondary hopper t' i', substantially as and forthe purpose described.

5. The combination of the conducting-spout H j, its portion H runninghorizontally and its portion j vertically,with the combined pulverizingand screening machine, substantially as described.

6. The combination ofthe backwardly-lared screen F, having elevator F"formed on its rear flared end,witl1 the central shaft, a pulverizer, areturn feed mechanism, and gearing of the shaft and pulverizer,substantially` as and for the purpose described.

7. A screen, F, and elevator F', combined with the shaft B, screw feederG H, pulverizingrollers D, and suitable gear-wheels, substantially asand for the purpose described.

8. The pulverizing-case C, h aving chute 7L', and the rollers D D, incombination with the case E, inclined revolving screen F, and elevatorF, shaft B, and gearing ot' the rollers and the shaft, substantially asand for the purpose described.

. 9. A backwardly-flared revolving screen, F, having an elevator, F', onits rear flared end, with the stationary L-shaped conducting-tube H j,and the return feed screw G, substantially as and for the purposedescribed.

RYERSON D. GATES. lVitnesses:

E. O. HAsTEN, HARRY LAIRD.

